How to mock constructor with methods as an parameter using EasyMock? - easymock

Question

I want to test method "make()" using EasyMock. Inside a method there is a new object created with parameters. I wanted to know, how to write test case for the same using EasyMock ?
private void make(final Parent p) {
fun = new Fun(getMethod1(), getMethod2(), getMethod3(), getMethod4());
fun.setBorder(120);
p.add(fun);
}
private ProductSpecification getMethod1() {
return getSequence();
}
//XYZ.class
#Override
public T getSequence() {
return this.sequence;
}
public View getMethod2() {
return view;
}
public Info getMethod3() {
return this.info;
}
Any help would be appreciated.
Thanks.

Answer 1

You can't directly do it with EasyMock. Some will tell you that you can mock the instantiation using PowerMock.
But it generally means a flaw in your design. I personally never use PowerMock.
The questions to ask are:
Do I really need to mock that instantiation? If it's just some data, it's probably not needed
If I need to, should I extract a class or a method?
The answer to question 2 depends on how you will use it later.
If I extract a class, I will have
private final FunFactory funFactory;
private void make(Parent p) {
fun = funFactory.create(getMethod1(), getMethod2(), getMethod3(), getMethod4());
fun.setBorder(120);
p.add(fun);
}
#Test
public void test() {
Fun fun = mock(Fun.class);
FunFactory funFactory = mock(FunFactory.class);
expect(funFactory.create("m1", "m2", "m3", "m4")).andReturn(fun);
replay(fun, funFactory);
// do the test
}
And if I extract a method, I will have the following.
private void make(Parent p) {
fun = createFun(getMethod1(), getMethod2(), getMethod3(), getMethod4());
fun.setBorder(120);
p.add(fun);
}
Fun createFun(String m1, String m2, String m3, String m4) {
return new Fun(m1, m2, m3, m4);
}
#Test
public void test() {
Fun fun = mock(Fun.class);
Make make = partialMockBuilder(Make.class)
.addMockedMethod("createFun")
.createMock();
expect(make.createMock("m1", "m2", "m3", "m4")).andReturn(fun);
replay(fun, make);
// do the test
}